Ingot-mold for the manufacture of steel.



EENJMN TALBOT, 0F MIBQDDLESBiROUGI-I, ENGLAND.

INGOTMOLD FCR THE MANUFACTURE 0F STEEL.

meneer.

Specification of Letters Patent.

Application mea Merch 13, 191s, serial No. 222,182.

To all whom t maly concern.'

Be it known that I, BENJAMIN TALBOT, a subject ofthe King of GreatBritain, residing in Middlesbrough, England, have invented ertain newand useful Improvements in lngot-Molds for the Manufacture of Steel, of`ivhich the following is a specification.

This invention relates to an improvement in ingotimolde used in theA:rnainitaeture'of steel, whereby an improvement is also brought aboutin the steel itself east' in such improved mold. f

It is known that in that fern-i of ingot mold known as brick topped moldthe steel ingot east in same will have the piped and segregated arealocated almost entirely in the to part of theingot which is surroundediiyfthe interior brieked lining, so' that the mam part of the ingotbelow the bricked part is thereby improved inquality.

` tions of ingot, molds top to the/mold, further liquid d0' till In alarge works,however, the hrieking and keepingin repair 'of the bricktopped seebecomes a serious item, as such briclted topped ingotv moldwill only run a few /heats without requiring renewal of the brickedportion. Moreover, unless very special care isialcen in brie-king, thejoints of the bricks prevent the ready stripping of `the ingot, l

In lieu of having a brick toppedniold it has beeri proposed to place auannular iron receptacle on top of the mold, and before or directly aftercasting to fill .the annular Space `0r chamber with 'liquid slagr orother suitable heated'body, such for instance as Sand, to. about thelevel oi the molten metal upon thel top or' which, or upon a metal slagor sand is run. ln this proposed arrangement Imuch of the'upper portionot the ingoia is in contact `with metal and 'notl with the slag'. orbrick work, and the piping;r is removed only to' a limited extent Whileaooording to the present invention the above drawbacks are re1noved,-amlat, the sainetinie an appreciable improvement in the position oi thepiped cavity in the inggot itneltia secured,- e oued Waste which lendsto bring about a `in the erop discard obtained after rolling.

According to this invention, instead of lining the upper partei" iheingot mold with bricks or raiimied ganister, l take an ingo() mold,recessed inthe upper portion, and

after arranging inside xsurh inold a-'suitable core, preferably of iron.supported-troni the upper part ot' the ingot niold and fittingl Patentensepa i7, wie.

closely into the interior ot' the mold atfthef4 point where the recessedpart ot' the niol'd commences, l run molten slag into the space thusformed between the recessed Vwalls of the mold and the central core,When the slag has set, l release the interior oore,I and allow it tofall, thereby leaving the in'got. mold with the upper recessed portionAlined with the slag for any required depth and thickness. It the taperon the core permits,

.it can of course be withdrawn. ,from the top after the slag has set.,bui in either event the eore is removed before the metal is east. Theslag I always prefer to use lis blast furnat-e slag, not too high inlune, butgrood results can be obtained from the slag obi tained from theopen-hearth.furnace itself especially from :leid open-hearth furnaces.The ingot molds, with the central core Vheld in position may beconveniently run on ycars under the slag spout attheblast furnace "iplant, or the Slag maybe stored in a yliquid condition in a heatedreceptacle.

In steel works, which have not a supply of suitable liquid slagavailable, the invention may be carried out, by casting or mold- Y ingfrom the solid Vslag a top of dimensions suitable to fit inl'olho recessin' the' ingot, mold and surh Casting: may be either in one piece or insuitable sections, and una be placed when cold into position in theingot mold. To strengthen the slag casting, steel turningrs or otherform of iron or Steel can be introduced into'the mass during casting.

In rases in which lliesteel ingot is east withfthe larger end oi theingot upyierniost' it is always preferable i'or the slug" iend to beseparate from lthe mold, so that the head ran bepulled of? the top ofthe ingot., so as to enable the ingot to be readily withdrawn from themold.

One-,of the advantugeh due to the use` of this slapr top is that a.small quantity of the slagf liipielied from the face of the slagltopltliis liquid slag floats on the top oi' the slieelfainl time causesthe steelV to remain liquid in the center and the segregation of theimpurities sueii as Sulfur and phosphorus (and carbon) to 'ne broughtnearer lOO te the actual top eilt' the steel ingot, thus decreasing thearea of the" segregated portion and localizing this segregated area intoone plate to the m spot where 1t can be means. v

vIn order to bring about a still greater differentiat'ion of heatbetween the slag top portion of the ingot and the portion sur; roundedonly b the'iron mold a thick` cover old may be provided and `madetreated by suitable 7 -f preferably of blast furnace or otherislag'clast4is of circular cross section. 20:-

into which recess molten slag is pouredwhen ,Separately.: This slagcover slightly melts owing to the heat of the steel,\and tends to ke'ethe slag mold in good condit1on.

he accompanying drawings illustrate examples-of molds according toitheinvention.

the core is in osition', o'1 a1caster molded top may be provi `ed to fitthe recess as explained above.' E is a-metal cover plate and F anopening through which liquid slag can be introduced. into the recess C.The lower yend of the core B fits in the inside ofthe case slightlybelow the enlarged top D. The core is supported by bars placed throughholesg G provided in the corevand resting on the to of themold.

laving thus described 'the nature of the j said 'invention and the bestmeans I know of carrymg thefsame into practical effect, I

[claim '1;' An ot mold comprising an iron casing; com 'inationwitharemovable central core with relationto 'which said vcasing is lspacedto-formachannel around said core, and a lining of. slag in said channel.

2. A11 ingot moldcomprising an iron casing having an enlarged `top, incombination with a removable central core with relation l v to'whichsaidenlarged top is spaced to form a channel around said core, and a liningof l.Slag in said channel.

3'. lAn ingot mold comprising fan iron casing, in, combination wlth a-removable centl'al vcore with relatlon to which saldcasing is spaced toform a channel of approximately 'I rectangular crossse'ction around saidcore,

Iand a lining of slag in said channel.

In witness whereof I have signed my name to this specification in thepresence ofv two Subscribing witnesses.

Witnesses:

A C. S. HOPKINS, f W. I. Skawmw BENJAMIN-TALBOT. y f

